define(["dojo/_base/declare",  
    "esri/layers/tiled"],  
    function (declare) {  
        return declare(esri.layers.TiledMapServiceLayer, {  
        	constructor:function () {
                this.spatialReference = new esri.SpatialReference({ wkid: 4326 });
                this.initialExtent = new esri.geometry.Extent(-180.0, -90.0, 180.0, 90.0, this.spatialReference);
                this.fullExtent = new esri.geometry.Extent(-180.0, -90.0, 180.0, 90.0, this.spatialReference);
                //
                this.tileInfo = new esri.layers.TileInfo({
                    "rows": 256,
                    "cols": 256,
                    "compressionQuality": 0,
                    "origin": {
                        "x": -180,
                        "y": 90
                    },
                    "spatialReference": {
                        "wkid": 4326
                    },
                    "lods": [
                        {"level" : 0, "resolution" : 0.703125,"scale" : 295497593.05875003},
                        {"level" : 1, "resolution" : 0.3515625, "scale" : 147748796.52937502},
                        {"level" : 2, "resolution" : 0.17578125,"scale" : 73874398.264687508},
                        {"level" : 3, "resolution" : 0.087890625, "scale" : 36937199.132343754},
                        {"level" : 4, "resolution" : 0.0439453125, "scale" : 18468599.566171877},
                        {"level" : 5, "resolution" : 0.02197265625, "scale" : 9234299.7830859385},
                        {"level" : 6, "resolution" : 0.010986328125, "scale" : 4617149.8915429693},
                        {"level" : 7, "resolution" : 0.0054931640625, "scale" : 2308574.9457714846},
                        {"level" : 8, "resolution" : 0.00274658203125, "scale" : 1154287.4728857423},
                        {"level" : 9, "resolution" : 0.001373291015625, "scale" : 577143.73644287116},
                        {"level" : 10, "resolution" : 0.0006866455078125, "scale" : 288571.86822143558},
                        {"level" : 11, "resolution" : 0.00034332275390625, "scale" : 144285.93411071779},
                        {"level" : 12, "resolution" : 0.000171661376953125, "scale" : 72142.967055358895},
                        {"level" : 13, "resolution" : 8.58306884765625e-005,"scale" : 36071.483527679447},
                        {"level" : 14, "resolution" : 4.291534423828125e-005, "scale" : 18035.741763839724},
                        {"level" : 15, "resolution" : 2.1457672119140625e-005, "scale" : 9017.8708819198619},
                        {"level" : 16, "resolution" : 1.0728836059570313e-005,"scale" : 4508.9354409599309},
                        {"level" : 17, "resolution" : 5.3644180297851563e-006, "scale" : 2254.4677204799655}
                    ]
                });
                this.loaded = true;
                this.onLoad(this);
            },
            getTileUrl: function (level, row, col) {
                return "http://t1.tianditu.cn/DataServer?T=cia_c&X=" + col + "&Y=" + row + "&L=" + (level*1 + 1) ;
            }
        });  
    });  
